Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 811

WIPERS/WASHERS - SERVICE INFORMATION

DESCRIPTION

FRONT WIPER/WASHER SYSTEM

The wiper and washer system includes the following major components:

•

Front Control Module - The Front Control Module (FCM) is integral to the Integrated Power Module (IPM).
The FCM/IPM is located in the engine compartment, near the right shock tower. (Refer to 8 - ELECTRICAL/
POWER DISTRIBUTION - DESCRIPTION).

•

Front Washer Nozzle - Two washer nozzles with integral check valves are secured to the hood panel near the
base of the windshield.

•

Front Washer Plumbing - The plumbing for the washer system consists of nylon hoses and molded plastic
fittings. The plumbing is routed within the engine compartment from the washer reservoir. The front washer
hose is routed across the underside of the hood panel to the washer nozzles.

•

Front Wiper Arms - The two wiper arms are secured with nuts to the threaded ends of the two wiper pivot
shafts, which extend through the cowl panel located near the base of the windshield.

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Front Wiper Blade - The two wiper blades are secured to the two wiper arms with an integral latch, and are
parked on the glass near the bottom of the windshield when the wiper system is not in operation.

•

Front Wiper Module - The wiper pivot shafts are the only visible components of the front wiper module. The
remainder of the module is concealed within the engine compartment beneath the cowl panel. The wiper mod-
ule includes a cast aluminum wiper module bracket, two rubber-isolated wiper module mounts, one dowel on
the underside of the wiper motor, the wiper motor crank arm, the two wiper drive links, the two powered wiper
pivots.

•

Instrument Cluster - The ElectroMechanical Instrument Cluster (EMIC) is also known as the Cab Compart-
ment Node (CCN). The EMIC/CCN is located in the instrument panel above the steering column opening,
directly in front of the driver. (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DESCRIPTION).

•

Multi-Function Switch - The multi-function switch is located on the steering column, just behind the steering
wheel. A control stalk that extends from the left side of the switch that is dedicated to providing all of the driver
controls for the front wiper and washer systems, turn signal, and high and low beam functions (Refer to 8 -
ELECTRICAL/LAMPS/LIGHTING - EXTERIOR/MULTI-FUNCTION SWITCH - DESCRIPTION).

•

Rain Sensor - Vehicles equipped with the automatic wiper feature have a Rain Sensor located just below the
inside rear view mirror button. The sensor bracket is bonded to the inside surface of the windshield glass.

•

Washer Fluid Level Switch - The washer fluid level switch is located in a dedicated hole on the lower portion
of the washer reservoir, ahead of the right front wheel house splash shield.

•

Washer Pump/Motor - The reversible electric washer pump/motor is located in the lower portion of the washer
reservoir, ahead of the right front wheel house splash shield. The washer pump/motor is a reversible motor
(wagon only) and provides washer fluid to either the front or rear (wagon only) washer system plumbing,
depending upon the direction of the pump motor rotation.

•

Washer Reservoir - The washer reservoir is mounted just in front of the right front wheel splash shield. The
filler neck is located in the right front corner of the engine compartment.

•

Wiper High/Low Relay - The wiper high/low relay is an International Standards Organization (ISO) micro relay
located in the Power Distribution Center (PDC) in the engine compartment.

•

Wiper On/Off Relay - The wiper on/off relay is an International Standards Organization (ISO) micro relay
located in the Power Distribution Center (PDC) in the engine compartment.

HEADLAMP WASHERS

The headlamp washers on this vehicle (if equipped) work in conjunction with the windshield washers. The headlamp
washers are enabled with the headlamps “ON” and the windshield washers activated. With the windshield washers
activated the headlamp washers will spray once for a predetermined amount of time.

REAR WIPER/WASHER SYSTEM - WAGON ONLY

The rear wiper and washer system includes the following major components:

•

Front Control Module - The Front Control Module (FCM) is integral to the Integrated Power Module (IPM).
The FCM/IPM is located on the side of engine compartment. (Refer to 8 - ELECTRICAL/POWER DISTRIBU-
TION - DESCRIPTION).

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WIPERS/WASHERS - SERVICE INFORMATION

•

Instrument Panel Switch Pod - The rear wiper/washer switch is part of the instrument panel switch pod. The
pod contains the rear wipe/wash switch, the hazard switch, the passenger airbag disabled (PAD) indicator, and
the electronic stability program (ESP) off switch. The instrument panel switch pod is located in the instrument
panel center bezel, just above the radio and in between the A/C outlets.

•

Rear Washer Nozzle - A rear washer nozzle is secured to a mounting hole in the liftgate panel.

•

Rear Washer Plumbing - The plumbing for the washer system consists of nylon hoses and molded plastic
fittings. The rear washer hose is routed through the dash panel from the engine compartment into the pas-
senger compartment, along the right side body harness, then up the c-pillar and into the liftgate.

•

Rear Wiper Arm - The single rear wiper arm is secured by a nut directly to the rear wiper motor output shaft,
which extends through the center of the liftgate outer panel near the base of the liftgate glass.

•

Rear Wiper Blade - The single rear wiper blade is secured to the rear wiper arm with an integral latch, and is
parked near the bottom of the liftgate glass when the rear wiper system is not in operation.

•

Rear Wiper Motor - The rear wiper motor output shaft is the only visible component of the rear wiper motor.
The remainder of the motor is concealed within the liftgate beneath the liftgate. The rear wiper motor includes
the motor bracket, the rear wiper motor, and the rear wiper motor park switch.

•

Rear Wiper Relay - The rear wiper relay is located in the Power Distribution Center (PDC) in the engine com-
partment near the battery.

•

Washer Reservoir - The rear washer system shares a single reservoir and reversible pump with the front
washer system, but has its own dedicated plumbing.

OPERATION

FRONT WIPER/WASHER SYSTEM

All front wiper and washer system functions are initi-
ated with the control knob on the end of the multi-
function switch control stalk that extends from the left
side of the steering column, just behind the steering
wheel. Rotating the control knob on the end of the
control stalk, selects the Off, Intermittent, Auto (on
models equipped with automatic wipers), Low, or High
front wiper system operating modes. In the Intermittent
mode, the control knob also allows the vehicle opera-
tor to select from one of six intermittent wipe intervals.
In the Auto mode, the control knob also allows the
vehicle operator to select from one of six automatic wiper sensitivity levels. Pressing in on the end of the control
stalk momentarily activates the Mist Wipe. Pressing it in all the way will activate the windshield washers. In the Auto
mode, as you increase the sensitivity of the wipers (less delay between wipes), the result will be a corresponding
acknowledgment wipe to let you know you made an adjustment to the system. The multi-function switch provides
hard wired resistor multiplexed inputs to the Steering Column Control Module (SCCM), for all of the wiper and
washer system functions. The SCCM then sends electronic messages to the Front Control Module (FCM) over the
Controller Area Network (CAN) data bus requesting the appropriate front wiper and washer system operating
modes.

All the front wiper and washer system operation is controlled by the FCM logic circuits, and that logic will only allow
these systems to operate when the ignition switch is in the Accessory or On positions. Battery current is directed
from a B(+) fuse in the Integrated Power Module (IPM) to the wiper on/off relay and the wiper high/low relay in the
PDC through a fused B(+) circuit. The FCM uses low side drivers to control wiper system operation by energizing
or de-energizing the wiper high/low and wiper on/off relays. The FCM uses both high side and low side drivers to
control the operation of the washer pump/motor unit. The multi-function switch circuitry receives a clean ground
output from the SCCM on a multi-function switch return circuit, then provides resistor multiplexed inputs to the
SCCM on an intermittent wipe mux circuit to indicate the selected wiper system mode and on a wash/beam select
mux circuit to indicate the selected washer system mode.

WIPERS/WASHERS - SERVICE INFORMATION

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AUTOMATIC WIPE MODE

In models equipped with the automatic wiper feature, the internal circuitry of both the multi-function switch, the rain
sensor, and the CCN work in concert to provide an automatic wiper mode with five sensitivity selections. When
selected, this switch position will automatically operate the front wipers at the designated sensitivity setting and
maintain visibility through the windshield glass at that predetermined sensitivity setting.

With automatic wipers, when the control knob on the control stalk of the multi-function switch is moved to one of the
six Auto sensitivity positions, the SCCM sends an electronic message to the Rain Sensor over the Controller Area
Network (CAN) data bus network indicating the selected position. The sensor monitors an area within the wipe pat-
tern of the windshield glass for the accumulation of moisture. Based upon internal programming and the selected
sensitivity level, when sufficient moisture has accumulated the rain sensor sends the appropriate electronic wipe
command messages to the FCM over the CAN data bus and the FCM operates the front wiper system accordingly.

As the sensitivity level is set higher, the rain sensor is more sensitive to moisture accumulation and will send wipe
commands more frequently. The SCCM logic is also programmed to provide an immediate wipe cycle each time the
control knob on the multi-function switch is moved from a non-automatic wipe position to one of the six Auto sen-
sitivity positions, and another immediate wipe cycle each time the control knob is moved from a lower Auto sensi-
tivity position to a higher Auto sensitivity position.

CONTINUOUS WIPE MODE

When the Low position of the control knob on the control stalk of the multi-function switch is selected, the SCCM
sends an electronic wiper switch low message to the FCM, then the FCM energizes the wiper on/off relay. This
directs battery current through the normally open contacts of the energized wiper on/off relay and the normally
closed contacts of the de-energized wiper high/low relay to the low speed brush of the wiper motor, causing the
wipers to cycle at low speed.

When the High position of the control knob is selected, the SCCM sends an electronic wiper switch high message
to the FCM, then the FCM energizes both the wiper on/off relay and the wiper high/low relay. This directs battery
current through the normally open contacts of the energized wiper on/off relay and the normally open contacts of the
energized wiper high/low relay to the high speed brush of the wiper motor, causing the wipers to cycle at high
speed.

When the Off position of the multi-function switch control knob is selected, the SCCM sends an electronic wiper
switch off message to the FCM. If the wiper motor was operating at high speed, the FCM immediately de-energizes
the wiper high/low relay causing the wiper motor to return to low speed operation. Then one of two events will
occur. The event that occurs depends upon the position of the wiper blades on the windshield at the moment that
the control knob Off position is selected.

If the wiper blades are in the down position on the windshield when the Off position is selected, the park switch that
is integral to the wiper motor is closed to ground and provides a hard wired park switch sense input to the FCM.
The FCM then de-energizes the wiper on/off relay and the wiper motor ceases to operate. If the wiper blades are
not in the down position on the windshield at the moment the Off position is selected, the park switch is an open
circuit and the FCM keeps the wiper on/off relay energized, which causes the wiper motor to continue running at low
speed until the wiper blades are in the down position on the windshield and the park switch input to the FCM is
again closed to ground.

HEADLAMPS ON WITH WIPERS MODE

The CCN provides an automatic headlamps on with wipers feature for models equipped automatic headlamps. This
is a customer programmable feature. If this feature is enabled, the headlamps will turn on automatically whenever
the windshield wipers are turned on; and, if the headlamps were turned on automatically when the wipers were
turned on, they will also turn off automatically when the wipers are turned off. If this feature is enabled, when the
automatic wiper mode is selected the headlamps will turn on automatically only after the wipers complete a mini-
mum of five automatic wipe cycles within about sixty seconds, and they will turn off automatically after four minutes
elapse without any wipe cycles.

INTERMITTENT WIPE MODE

When the control knob on the control stalk of the multi-function switch is moved to one of the Intermittent interval
positions the SCCM sends an electronic wiper switch delay message to the FCM, then the FCM electronic inter-
mittent wipe logic circuit responds by calculating the correct length of time between wiper sweeps based upon the
selected delay interval input. The FCM monitors the changing state of the wiper motor park switch through a hard

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WIPERS/WASHERS - SERVICE INFORMATION

wired park switch sense input. This input allows the FCM to determine the proper intervals at which to energize and
de-energize the wiper on/off relay to operate the wiper motor intermittently for one low speed cycle at a time.

The FCM logic is also programmed to provide vehicle speed sensitivity to the selected intermittent wipe delay inter-
vals. In order to provide this feature the FCM monitors electronic vehicle speed messages from the Powertrain Con-
trol Module (PCM) and doubles the selected delay interval whenever the vehicle speed is approximately sixteen
kilometers-per-hour (ten miles-per-hour) or less.

PULSE WIPE MODE

When the control knob on the control stalk of the multi-function switch is depressed to the momentary pulse wipe
position for less than about one-half second, the SCCM sends an electronic switch message to the FCM, then the
FCM energizes the wiper on/off relay for one complete wipe cycle. The FCM de-energizes the relay when the state
of the park switch sense changes to ground, parking the wiper blades near the base of the windshield.

WASH MODE

When the control knob on the control stalk of the multi-function switch is depressed to the momentary Wash position
for more than about one-half second, the SCCM sends an electronic washer switch message to the FCM, then the
FCM directs battery current and ground to the washer pump/motor unit. This will cause the washer pump/motor unit
to be energized for as long as the Wash switch is held closed up to about ten seconds, and to de-energize when
the front Wash switch is released.

When the control knob is depressed to the momentary Wash position while the wiper system is operating in one of
the intermittent interval positions, the washer pump/motor operation is the same. However, the FCM also energizes
the wiper on/off relay to override the selected delay interval and operate the wiper motor in a continuous low speed
mode for as long as the control knob is held depressed, then de-energizes the relay and reverts to the selected
delay mode interval several wipe cycles after the control knob is released. If the control knob is held depressed for
more than about ten seconds, the FCM will suspend washer pump/motor operation until the knob is released. then
cycled back to the Wash position if so desired.

The headlamp washer system (if equipped) utilizes a separate high pressure pump that is attached to the wind-
shield washer reservoir. The headlamp washer pump feeds nozzles that are mounted in the front fascia of the vehi-
cle. The nozzle bodies spray the headlamps with high pressure washer solvent when the system is activated.

To activate the headlamp washers, turn ON the headlamps and then press the windshield washer control knob. This
will operate the windshield washers and direct two timed high pressure sprays onto the headlamp lens.

WIPE-AFTER-WASH MODE

When the control knob on the control stalk of the multi-function switch is depressed to the momentary Wash position
for more than about one-half second while the wiper system is not operating, the instrument cluster sends an elec-
tronic washer switch message to the FCM, then the FCM directs battery current and ground to the washer pump/
motor unit and energizes the wiper on/off relay. This will cause the washer pump/motor unit to be energized and
operate the wiper motor in a continuous low speed mode for as long as the Wash switch is held closed up to about
ten seconds. When the control knob is released, the FCM de-energizes the washer pump/motor unit, but allows the
wiper motor to operate for several additional wipe cycles before it de-energizes the wiper on/off relay and parks the
wiper blades near the base of the windshield.

If the control knob is held depressed for more than about thirty seconds, the FCM will suspend washer pump/motor
operation until the knob is released, then cycled back to the Wash position; however, the wipers will continue to
operate for as long as the Wash switch is held closed. The FCM monitors the changing state of the wiper motor
park switch through a hard wired wiper park switch sense circuit input. This input allows the FCM to count the
number of wipe cycles that occur after the Wash switch is released, and to determine the proper interval at which
to de-energize the wiper on/off relay to complete the wipe-after-wash mode cycle.

WIPERS/WASHERS - SERVICE INFORMATION

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